Notes from the Microsoft Band 2 today

I had two exercise sessions today: weights at Bull’s place, and then a walk. I wore the band for the first time in months. Below are notes I wrote in Evernote by looking at the band itself while trying to get it to sync.

Band won’t sync, so I may have to reset and lose this data.
Workout 1 at Bull’s place:
Duration 1:15
I ran the watch from just before class started until 15 minutes after it ended.
calories 431
peak HR 155
Avg HR 115
Duration in heart ranges:
17 seconds at 90-100% (so let’s say my peak of 155 = 90%, and max HR = 172 — one flaw in this device is that it doesn’t know my real max heart rage. How does it calculate it? “The Band app predicts your maximum heart rate based on your age and uses it to generate personalized heart-rate training zones. Your max heart-rate value adapts to you. If you consistently exceed your predicted value, your max heart rate will increase.”)
4 minutes at 80-90%
20 minutes at 70-80%
The band has now synced. It says during the workout, I burned a virtually equal number of fat and glucose calories.
Workout 2, walk from Jackson and 26th down to Leschi Mkt and back:
Duration 1:02 (2.5 miles, ~400ft elev gain)
Calories 310
peak HR 141
avg HR 108
Duration in HR ranges is not shown
“The fat-burning range will lie between 50 and 75 percent of your heart-rate reserve.” (from Active dot com — I have pretty much known nothing about the “zones”. I’m more interested in them now, because without all the hours of daily activity of zinging around in the gym, I’m concerned about staying active enough to burn what I eat. Most of the daily burn is not from a “hard workout” of short duration, but from the entire day’s low-intensity activity.)
My resting heart rate in October was 50
Heart rate reserve (Max minus resting) = 122
50% of 122 is 61
75% of 122 is 92
add the resting heart rate to both numbers:
“Fat burning zone”: 111-142 bpm
65% to 83% of max 172
During my walk, I was in this zone all the time.
During my workout, I was in this zone most of the time.
The band has now synced. It says on the walk I burned a virtually equal number of fat and glucose calories.